SIZE EFFECT ON TRANSPORT-PROPERTIES OF SOLID ELECTROLYTES WITH GAMMA-LI3PO4-TYPE STRUCTURES

Electrical properties of solid lithium-conducting electrolytes are stu died in the following systems: 0.6Li(4)Si(1-x)Ge(x)O(4) . 0.4Li(3)PO(4 ) (system I) and 0.6Li(4)Si(1-x)Ge(x)O(4) . 0.4Li(3)VO(4) (system II), which have structures of the gamma-Li3PO4 type. It has been shown tha t the change in conductivity due to the replacement of silicon cations with larger germanium cations is different in the systems studied. In system I, the size effect manifests itself over the entire range of c ompositions, while in system II, this effect is appreciable only when x > 0.6. The difference in behavior Of the systems under study is acco unted for on the basis of the cluster model of solid electrolyte struc tures.